PS any advice on setting brake bias now IVA requires balance adjustments now have to be welded to permanently prevent adjustment. I see why you wouldn't want it accidentally changing, but permanently preventing adjustment seems very unhelpful and means it's got to be spot on from the start!!
The gov have actually been helpful and provided a run down of top 10 reasons for IVA failures and have a really helpful guide with pics and straight talking advice. Still not expecting to pass first time thought from everyone experiences